JP3664300B2 - IP traffic congestion avoidance method in front of time-division communication path of existing switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exchange that accommodates both voice calls of telephone subscribers and data calls of Internet subscribers, and more particularly, to an IP traffic congestion avoidance method in the front stage of a time division communication path of the exchange.
[0002]
[Prior art]
FIG. 1 shows an example of an exchange in which a voice call of a telephone subscriber and a data call of an Internet subscriber are mixedly accommodated, where 1a to 1n are subscribers, 2a to 2n are subscriber circuits, Subscriber circuit unit, 4 is a concentrator circuit, 5 is a communication path line in an exchange, 6 is a time division switch, 7 and 10 are control paths, 8 is a front-stage D channel termination device, 9 is a central processing unit, and 11 is a rear stage D channel. The terminator 12 is a control processor.
[0003]
The subscriber circuit device 3 includes subscriber circuits 2 a to 2 n, a concentrator circuit 4, and a control processor 12, and the subscribers 1 a to 1 n are terminated by subscriber circuits 2 a to 2 n in the concentrator circuit 4.
[0004]
The call signals from the subscriber circuits 2a to 2n are collected by the concentrator circuit 4 based on the control of the control processor 12, and are carried from the intra-switch communication line 5 to the upper time division switch 6.
[0005]
A pre-stage D channel termination device 8 is connected to the concentrator circuit 4 via the control path 7 to terminate the ISDN D channel at the pre-stage of the time division switch 6.
[0006]
FIG. 3 is a diagram showing a flow of voice and data call signals in a conventional exchange that accommodates voice calls of telephone subscribers and data calls of Internet subscribers in a mixed manner.
[0007]
In the conventional exchange, as shown in FIG. 3, the subscribers 1a to 1n are distinguished from the accommodated subscribers for a mixture of voice calls V1 to Vn of telephone subscribers and data calls D1 to Dn of Internet subscribers. Without doing so, voice calls V1 to Vn of telephone subscribers and data calls D1 to Dn of Internet subscribers are assigned to the call signal channel regions X1 to Xn.
[0008]
In this conventional exchange, when the D channel is terminated by the preceding D channel terminating device 8, the succeeding D channel terminating device 11 becomes unused, and is reserved for terminating by the unused latter D channel terminating device 11. The D channel regions Y1 to Yn of the exchange channel line 5 in the exchange are also unused.
[0009]
[Problems to be solved by the invention]
As described above, in the conventional system, the voice calls V1 to Vn of the telephone subscriber and the data calls D1 to Dn of the Internet subscriber are in a call even though the D channel areas Y1 to Yn of the intra-switch communication line 5 are not used. Since it is set only in the range of the signal channel regions X1 to Xn, the call signal channel regions X1 to Xn become the upper limit of the capacity of the accommodated subscribers.
[0010]
The switchboard accommodates telephone subscriber voice calls and Internet subscriber data calls as accommodating subscribers, but Internet subscriber data calls are prolonged due to Internet surfing such as browsing the World Wide Web (www). In many cases, the line is put on hold.
[0011]
If the call signal channel area of the intra-switch communication line 5 is occupied for a long time by the data calls D1 to Dn of the Internet subscriber, the voice calls V1 to Vn of the telephone subscriber become difficult to be connected. It becomes a cause of congestion that affects call connections.
[0012]
This congestion is traffic congestion caused by the fact that the voice call of the telephone subscriber and the data call of the Internet subscriber are not distinguished from each other and are all handled as a call signal in the exchange.
[0013]
As a method of avoiding such congestion, a method of avoiding the congestion by adding facilities as in the case of avoiding the congestion of the voice calls V1 to Vn of the telephone subscriber is conceivable.
[0014]
The object of the present invention is to respond to voice calls V1 to Vn of telephone subscribers by data calls D1 to Dn from Internet subscribers generated before the time division switch 6 of the originating exchange without adding equipment. The object is to provide means for avoiding congestion effects.
[0015]
[Means for Solving the Problems]
The present invention uses a hardware configuration for terminating an ISDN D channel in an existing exchange system, and makes a telephone call by a data call of an Internet subscriber that occurs before the time division switch of the originating exchange near the calling subscriber. It is characterized by avoiding traffic congestion for a subscriber's voice call.
[0016]
Specifically, in the hardware configuration of an exchange system capable of terminating the ISDN D channel at the front stage and the rear stage of the time division switch, the D channel of the ISDN is terminated at the rear stage by terminating the ISDN D channel at the front stage of the time division switch. A data call of an Internet subscriber is allocated to an empty channel of an intra-switch communication path line reserved in advance for termination.
[0017]
In the invention of the present application, the data call of the Internet subscriber is assigned to an unused empty channel, not the call signal channel of the intra-switch communication path, in distinction from the voice call of the telephone subscriber, thereby affecting the voice call of the telephone subscriber. Therefore, it is possible to avoid congestion that occurs at the front stage of the time division switch of the exchange.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an embodiment of an exchange system to which the present invention is applied. The configuration is the same as that of an existing exchange except that an IP traffic congestion avoiding means is provided in the preceding stage of a time division speech path. It has become.
[0019]
That is, 1a to 1n are subscribers, 2a to 2n are subscriber circuits, 3 is a subscriber circuit device, 4 is a concentrator circuit, 5 is a telephone line in an exchange, 6 is a time division switch, 7 and 10 are control paths, Reference numeral 8 denotes a front-stage D channel termination device, 9 denotes a central processing unit, 11 denotes a rear stage D-channel termination device, and 12 denotes a control processor.
[0020]
The subscriber circuit device 3 includes subscriber circuits 2 a to 2 n, a concentrator circuit 4, and a control processor 12, and the subscribers 1 a to 1 n are terminated by subscriber circuits 2 a to 2 n in the concentrator circuit 4.
[0021]
The call signals from the subscriber circuits 2a to 2n are collected by the concentrator circuit 4 based on the control of the control processor 12, and are carried from the intra-switch communication line 5 to the upper time division switch 6.
[0022]
The concentrator 4 is connected to a pre-stage D channel terminating device 8 for terminating the ISDN D channel at the pre-stage of the time division switch 6 via a control path 7.
[0023]
The time division switch 6 is connected to a post-stage D channel termination device 11 that terminates the D channel of the ISDN at the rear stage of the time division switch 6 via the central processing unit 9 and the control path 10.
[0024]
The present invention realizes a system that controls and avoids the congestion affecting the voice call of the telephone subscriber due to the data call of the Internet subscriber who holds the line for a long time by the above configuration.
[0025]
Next, the operation of the present embodiment based on FIG. 1 will be described.
[0026]
The subscribers 1a to 1n accommodated in the subscriber circuits 2a to 2n of the subscriber circuit device 3 are concentrated by the concentration circuit 4 and then sent to the upper time division switch 6 via the intra-switch communication line 5. .
[0027]
The subscribers 1a to 1n include a voice call of a telephone subscriber from a telephone and a data call of an Internet subscriber from a terminal such as a personal computer.
[0028]
In general, the congestion of the calling exchange near the calling subscriber includes congestion that occurs before the time division switch 6. As described above, this is because the data call of the Internet subscriber who holds the line for a long time occupies the concentrator circuit 4 and the telephone line 5 within the exchange after being concentrated, so that the voice call of the telephone subscriber is This is because it becomes difficult to be connected to the time division switch 6 which is a host device.
[0029]
In an exchange having a system configuration in which the D channel of ISDN can be terminated by the preceding D channel terminating device 8 and the succeeding D channel terminating device 11, in order to terminate the D channel of the ISDN in the succeeding D channel terminating device 11, the switching channel line 5 is used for the D channel. The channel area is reserved in advance other than the area for the call signal channel.
[0030]
When the D channel is extracted in the concentrator circuit 4 that collects call signals, and the D channel signal is terminated by the preceding D channel terminating device 8 via the control path 7, the succeeding D channel terminating device 11 in the subsequent stage of the time division switch 6. The channel region for the D channel reserved in the intra-switch communication path line 5 for terminating at is in an unused state.
[0031]
By terminating the D channel of the ISDN with the preceding D channel terminating device 8, an unused channel area reserved for the succeeding D channel terminating device 11 is allocated to the data call of the Internet subscriber to avoid congestion. The method is as follows.
[0032]
As a result of analysis of the subscribers 1a to 1n by the control processor 12 and the central processing unit 9 in the subscriber circuit device 3, the voice call of the subscriber determined as a telephone subscriber is in accordance with the operation of the conventional exchange, The concentrator circuit 4 assigns the speech signal channel area reserved for the speech signal channel of the line 5.
[0033]
On the other hand, the data call of the subscriber determined as an Internet subscriber is placed in the D channel area reserved for the D channel of the intra-switch communication line 5 to terminate at the subsequent D channel terminating device 11 in the concentrator circuit 4. assign.
[0034]
By using the above method, an unused D channel area for the rear stage D channel terminating device 11 of the intra-switch communication path line 5 is allocated to the Internet call, so that it is reserved for the call signal of the intra-switch path path 5. Internet subscriber data calls can be carried without using the call signaling channel area.
[0035]
FIG. 2 is a diagram for explaining a flow of voice and data call signals in the configuration of FIG. Hereinafter, it will be described in more detail with reference to FIG.
[0036]
The subscribers 1a to 1n in FIG. 1 are mixed with voice calls V1 to Vn of telephone subscribers and data calls D1 to Dn of Internet subscribers in FIG.
[0037]
The communication path line 5 in the exchange has call signal channel areas X1 to Xn reserved for call signals, and D channel areas Y1 to Yn reserved for terminating the D channel in the subsequent D channel terminating device 11. Exists.
[0038]
Through the analysis and control by the control processor 12 and the central processing unit 9 in FIG. 1, the voice calls V1 to Vn of the telephone subscribers are transferred to the call signal channel areas X1 to Xn reserved for the call signals of the intra-switch communication path line 5. Assigned.
[0039]
On the other hand, data calls D1 to Dn of Internet subscribers are assigned to terminate the D channel at the subsequent D channel terminating device 11 which is unused when terminating the D channel of ISDN at the preceding D channel terminating device 8. Assigned to the D channel regions Y1 to Yn.
[0040]
By using the above-described control and unused channels, congestion due to data calls D1 to Dn of Internet subscribers affecting voice calls V1 to Vn of telephone subscribers can be avoided.
[0041]
In the present embodiment, analysis is performed by the control processor 12 and the central processing unit 9 in FIG. 1, and as shown in FIG. 2, the voice calls V1 to Vn of the telephone subscriber are placed in the call signal channel regions X1 to Xn and the Internet subscriber's voice calls V1 to Vn. By distributing the data calls D1 to Dn to the unused D channel areas Y1 to Yn, a congestion avoiding method is provided in which the data calls D1 to Dn are fixedly allocated to the intra-switch communication path line 5 in the switch.
[0042]
As an embodiment related to this analysis method, when connecting to an Internet service provider (hereinafter referred to as ISP), an incoming number to an access point such as a remote access server is analyzed, and the incoming number is the ISP telephone number. If the determination is made, there is a method in which the original ISDN D channel areas Y1 to Yn are fixedly assigned as the channel areas of the Internet subscriber data calls D1 to Dn.
[0043]
In the present system, since the Internet subscriber data calls D1 to Dn are fixedly assigned to the D channel areas Y1 to Yn, the telephone subscriber voice calls V1 to Vn are transmitted to the call signal channel areas X1 to Xn. When the Internet subscriber data calls D1 to Dn are greater than the range of Xn and less than the range of the D channel regions Y1 to Yn, the telephone subscriber's voice calls are limited to the call signal channel regions X1 to Xn. Even when the D channel regions Y1 to Yn are vacant, they are discarded.
[0044]
As another embodiment of the present invention, when the D channel regions Y1 to Yn are vacant depending on the analysis method and settings, the voice calls V1 to Vn of the telephone subscriber are in a range exceeding the call signal channel regions X1 to Xn. By assigning the calls to the D channel areas Y1 to Yn, it is possible to further improve the efficiency of line use of the intra-switch communication path line 5.
[0045]
Similarly, when there are many data calls D1 to Dn of Internet subscribers and few telephone calls are made by telephone subscribers, calls in the range where the Internet subscriber data calls exceed the D channel areas Y1 to Yn are not available. By allocating to the call signal channel areas X1 to Xn, it is possible to improve the efficiency of line use of the intra-switch communication path line 5.
[0046]
【The invention's effect】
According to the present invention, a channel for a call signal is allocated by allocating an unused ISDN D-channel area reserved in advance on the intra-switch communication path line to a data call of an Internet subscriber with a long line hold time. It can carry Internet subscriber data calls without using them.
[0047]
Therefore, by efficiently using the unused channel of the intra-switch communication line by distinguishing the voice call of the telephone subscriber and the data call of the Internet subscriber, the voice call of the telephone subscriber in the front stage of the time division switch of the originating exchange It is possible to avoid congestion due to data calls of Internet subscribers.
[Brief description of the drawings]
FIG. 1 is a block diagram of an exchange to which the present invention is applied.
FIG. 2 is a diagram showing a flow of voice and data call signals in the embodiment of the present invention.
FIG. 3 is a diagram showing a flow of voice and data call signals in a conventional example.
[Explanation of symbols]
1a to 1n Subscriber 2a to 2n Subscriber circuit 3 Subscriber circuit device 4 Concentrator circuit 5 Switch-in-communication path line 6 Time division switch 7, 10 Control path 8 Pre-stage D channel terminator 9 Central processing unit 11 Post stage D channel terminator 12 Control processor

Claims (7)

An IP traffic congestion avoidance method in an exchange system capable of terminating the ISDN D channel at the front stage and the rear stage of the time division switch, wherein the D channel is terminated at the rear stage by terminating the ISDN D channel at the front stage of the time division switch. An IP traffic congestion avoidance method, comprising: allocating a data call of an Internet subscriber to a subsequent D channel area of a communication line in an exchange that is reserved in advance for termination. When connecting to an Internet service provider (hereinafter referred to as ISP), the incoming call number to the access point is analyzed, and if the incoming call number is determined to be the ISP telephone number, the latter D channel area is set to the Internet subscriber's telephone number. 2. The IP traffic congestion avoiding method according to claim 1, wherein the IP traffic congestion avoiding method is fixedly assigned as a channel area of a data call. When the number of data calls is small, the latter D channel area is free, and the voice call of the telephone subscriber exceeds the call signal channel area of the intra-switch line, the voice calls in the above range are 3. The IP traffic congestion avoidance method according to claim 1, wherein the IP traffic congestion avoidance method is assigned to a free area of a subsequent D channel area. When there are few voice calls of the telephone subscribers, and the call signal channel area of the intra-switch line is free and the data call exceeds the latter D channel area, 3. The IP traffic congestion avoidance method according to claim 1, wherein the IP traffic congestion avoidance method is assigned to a call signal channel area of the intra-switch communication path line. A subscriber circuit having a subscriber circuit for terminating a voice call and a data call from each subscriber, a concentrator circuit for concentrating speech signals from the subscriber circuit, and a control processor for controlling the concentration of the concentrator circuit; A time-division switch in which call signals collected by the line concentrator circuit are input via a communication path line in an exchange, and a D channel of ISDN connected to the line concentrator circuit via a control path are terminated at the previous stage of the time-division switch. A pre-stage D-channel terminator, a post-stage D-channel terminator connected to the time-division switch via a control path and terminating the ISDN D-channel in a post-stage of the time-division switch, and a center connected to the time-division switch In an exchange system comprising a processing device,
The control processor and the central processing unit extract a D channel in a concentrator circuit that collects the call signal, and terminate the extracted D channel in the preceding D channel termination device via the control path. Analyzing the signal, if the call signal is a voice call from the subscriber, it is assigned to the call signal channel area of the intra-switch line, and if the call signal is a data call from the subscriber, A switching system having a function of performing control to allocate to an area reserved for the latter-stage D-channel termination device. When the control processor and the central processing unit have few data calls, the latter D channel area is free, and the voice call of the telephone subscriber exceeds the call signal channel area of the intra-switch line. 6. The exchange system according to claim 5, further comprising a function of performing control for allocating the voice call in the above range to an empty area of the subsequent D channel area. The control processor and the central processing unit are configured when the voice call of the telephone subscriber is few, the call signal channel area of the intra-switch line is free, and the data call exceeds the subsequent D channel area. 6. The exchange system according to claim 5, wherein the exchange system has a function of performing control to allocate the data call in the above range to the call signal channel area of the intra-switch communication path line.

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